<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avater_box">
                <img src="../assets/logo.png">
            </div>
            <!-- 登录表单区域 -->
            <el-form label-width="0" class="login_form" :model="form" :rules="rules" ref="login_form_ref">
                <el-form-item prop="username">
                    <el-input prefix-icon="el-icon-user-solid" v-model="form.username"></el-input>
                </el-form-item>
                <el-form-item prop="password">
                    <el-input prefix-icon="el-icon-lock" v-model="form.password" show-password></el-input>
                </el-form-item>
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="reset">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default {
    data(){
        return{
            form:{
                username:'admin',
                password:'123456'
            },
            rules: {
                username: [
                    { required: true, message: '请输入用户名', trigger: 'blur' },
                    { min: 3, max: 50, message: '长度在 3 到 50 个字符', trigger: 'blur' }
                ],
                password: [
                    { required: true, message: '请输入密码', trigger: 'blur' },
                    { min: 6, max: 50, message: '长度在 6 到 50 个字符', trigger: 'blur' }
                ]
            }
        }
    },
    methods:{
        login:function(){
            this.$refs.login_form_ref.validate(async (valid) => {
                if(!valid) return;
                const {data:res} = await this.$http.post('login',this.form);
                console.log(res);
                if(res.meta.status!==200) return this.$message.error("登录失败，请检查用户名和密码是否正确！");
                this.$message.success("登录成功！");

                // 登录成功后将token保存到客户端的sessionStorage中
                window.sessionStorage.setItem("token",res.data.token);
                // 通过编程式导航跳转到后台主页，路由地址是/home
                this.$router.push('/home');
            })
        },
        reset:function(){
            this.$refs.login_form_ref.resetFields();
        }
    }
}
</script>

<style lang="scss" scoped>
.login_container{
    background-color: #2b4b6b;
    height: 100%;
}
.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left:50%;
    top:50%;
    transform: translate(-50%,-50%);
    .avater_box{
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left:50%;
        background-color: #fff;
        transform: translate(-50%,-50%);
        img{
            width:100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
}
.btns{
    display: flex;
    justify-content: flex-end;
}
.login_form{
    position: absolute;
    bottom:0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
</style>